//! RSA cross-cert generation

use std::time::SystemTime;

use derive_more::{AsRef, Deref, Into};

use tor_bytes::Writer as _;

use tor_llcrypto::pk::{ed25519, rsa};

use crate::CertEncodeError;

/// An RSA cross certificate certificate,

/// created using [`EncodedRsaCrosscert::encode_and_sign`].

///

/// It corresponds to the type of certificate parsed with

/// [`RsaCrosscert`](super::RsaCrosscert).

/// It is used to prove that an Ed25519 identity speaks

/// on behalf of an RSA identity.

///

/// The certificate is encoded in the format specified

/// in Tor's [certificate specification](https://spec.torproject.org/cert-spec.html#rsa-cross-cert)

///

/// This certificate has already been validated.

#[derive(Clone, Debug, PartialEq, Into, AsRef, Deref)]

pub struct EncodedRsaCrosscert(Vec<u8>);

impl EncodedRsaCrosscert {

    /// Create a new [`EncodedRsaCrosscert`] certifying `ed_identity` as

    /// speaking on behalf of `rsa_identity`.

    ///

    /// The certificate will expire no earlier than `expiration`,

    /// and no more than one hour later.

    /// (Expiration times in these certificates have a one-hour granularity.)

        {

        }

}

#[cfg(test)]

mod test {

    // @@ begin test lint list maintained by maint/add_warning @@

    #![allow(clippy::bool_assert_comparison)]

    #![allow(clippy::clone_on_copy)]

    #![allow(clippy::dbg_macro)]

    #![allow(clippy::mixed_attributes_style)]

    #![allow(clippy::print_stderr)]

    #![allow(clippy::print_stdout)]

    #![allow(clippy::single_char_pattern)]

    #![allow(clippy::unwrap_used)]

    #![allow(clippy::unchecked_time_subtraction)]

    #![allow(clippy::useless_vec)]

    #![allow(clippy::needless_pass_by_value)]

    //! <!-- @@ end test lint list maintained by maint/add_warning @@ -->

    use std::time::Duration;

    use tor_basic_utils::test_rng::testing_rng;

    use tor_checkable::{ExternallySigned, Timebound};

    use crate::rsa::{RsaCrosscert, SECS_PER_HOUR};

    use super::*;

    #[test]

    fn generate() {

        let mut rng = testing_rng();

        let keypair = rsa::KeyPair::generate(&mut rng).unwrap();

        let ed_id =

            ed25519::Ed25519Identity::from_base64("dGhhdW1hdHVyZ3kgaXMgc3RvcmVkIGluIHRoZSBvcmI")

                .unwrap();

        let now = SystemTime::now();

        let expiry = now + Duration::from_secs(24 * SECS_PER_HOUR);

        let cert = EncodedRsaCrosscert::encode_and_sign(&keypair, &ed_id, expiry).unwrap();

        let parsed = RsaCrosscert::decode(cert.as_ref()).unwrap();

        let parsed = parsed

            .check_signature(&keypair.to_public_key())

            .unwrap()

            .check_valid_at(&now)

            .unwrap();

        assert!(parsed.subject_key_matches(&ed_id));

        assert_eq!(parsed.subject_key, ed_id);

        let parsed_expiry = parsed.expiry();

        assert!(parsed_expiry >= expiry);

        assert!(parsed_expiry < expiry + Duration::new(3600, 0));

    }

}